page_title: Terrace Mountain (Washington)
section_title: Geology
hierarchical_section_title: Terrace Mountain (Washington) / Geology
caption_attribution_description: English: View of Terrace Mountain from Mac Peak
context_page_description: Terrace Mountain is a 6,361-foot mountain summit located in the Alpine Lakes Wilderness in eastern King County of Washington state. It's part of the Cascade Range and is situated on land managed by Mount Baker-Snoqualmie National Forest. The peak is situated 4 mi north of Mount Daniel, and is surrounded by Lake Clarice, Marmot Lake, Ptarmigan Lakes, and the Terrace Lakes. Precipitation runoff from the mountain drains into tributaries of the Skykomish River. The mountain's descriptive name stems from the terrace-like appearance created by a series of benches on its east aspect.
context_section_description: The Alpine Lakes Wilderness features some of the most rugged topography in the Cascade Range with craggy peaks and ridges, deep glacial valleys, and granite walls spotted with over 700 mountain lakes.  Geological events occurring many years ago created the diverse topography and drastic elevation changes over the Cascade Range leading to various climate differences. 
  During the Pleistocene period dating back over two million years ago, glaciation advancing and retreating repeatedly scoured and shaped the landscape. The last glacial retreat in the Alpine Lakes area began about 14,000 years ago and was north of the Canada–US border by 10,000 years ago. The "U"-shaped cross section of the river valleys are a result of that recent glaciation. Uplift and faulting in combination with glaciation have been the dominant processes which have created the tall peaks and deep valleys of the Alpine Lakes Wilderness area.
caption: Terrace Mountain in early spring
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